To perform the discount of contents use charge according to the number of subscribers to a pay contents providing service.

This system is provided with a portal sever 20 having a contents information storing means 20-3 for storing contents identification information and the discount rate of contents use charge set in every prescribed extent of the number of subscribers, a number of subscriber storing means 20-4 for storing the number of subscribers of a pay contents providing service at present for every contents identification information and a contents browsing means 20-7 for acquiring the number of subscribers at present from the number of subscriber storing means in response to access from a user terminal 10, and for extracting a discount rate to the number of subscribers at present from the contents information storing means, and for calculating the increasing number of candidate subscribers showing how many new subscribers are necessary for increasing the discount rate based on the extent of the number of subscribers corresponding to the discount rate and the number of subscriber at present, and for transmitting the discount rate and the increasing number of the candidate subscribers to the user terminal.